OAKLAND – The A’s made some wholesale changes to the Oakland organization’s minor league structure Tuesday, including moving longtime Triple-A manager Steve Scarsone to an instructor’s position while promoting Double-A manager Ryan Christenson to take over the Triple-A job at Nashville.

Ed Sprague, who spent the 2016 season as a consultant to the A’s player development department, has been installed as coordinator of instruction.

Fran Riordan, who managed at Single-A Beloit the last two years, moves up to take over at Double-A Midland in place of Christenson.

Christenson, currently managing the Mesa Solar Sox in the Arizona Fall League, is coming off back-to-back Texas League championships in 2015 and 2016 with the RockHounds. He’s been managing in the A’s system since 2013 and his teams have a combined .578 winning percentage (323-236) and have made the postseason in each of his first four seasons.

Scarsone has spent the last eight seasons managing in the A’s system, the last four seasons managing at Triple-A, first with the Sacramento River Cats and then the last two seasons after the franchise moved to Nashville.